The electrical code permits the installation of outlets with the ground plug hole pointing up, down, or sideways. It is all up to you. There is no such thing as a conventional electrical outlet orientation. As a result, there are no such things as upside-down outlets. If you want an outlet to be accessible for testing, it must be on the floor or lower.
The outlet box should be a standard size, and it should be placed directly under the slab or buried at least 1 inch deep. The metal screws that hold the outlet in place go through the box and into the slab. You will also need to use potted soil as filler around the base of the box to prevent electric circuits from being exposed if someone steps on the outlet with their foot or shoe.
Outlets can be mounted in a variety of ways depending on where they are going to be used. For example, an extension cord might only be needed for rewiring a single room, so it makes sense to put the outlet in that room and not waste space by putting it in the hallway. But if you intend to use the same wiring system throughout your house, then it's best to put outlets in key locations such as the garage and basement to avoid having to run extra wiring.
You should measure the distance between each outlet you plan to mount before you start digging.
Electricians may arrange the outlet upside-down so that the switch-controlled receptacle is easily identified. Because it sticks out visually to most people immediately away, it makes it easy for occupiers to recall which outlet is switch operated. This saves time when you need to change out a light bulb or appliance plug.
Other than that, there's no real reason to install an outlet this way. The orientation of the outlet does not affect how you use it; whether it's upside down or not, a device can still be plugged into it. It's just easier to see what's connected to the cord from the top if they're put in the right way around.
In addition, some wiring methods require that the outlet be installed in a particular direction to prevent accidental contact with live wires. If these methods are used, the installer will usually note it on the work order.
The only time I've seen an outlet installed backwards is when testing the wiring to make sure it's done correctly. With all the other cables and devices attached to the walls, it's hard to tell if something is wrong with just one outlet. By flipping it over, the electrician has an easier time seeing what's going on.
Overall, installing outlets the "right" way isn't really important unless you want to provide visitors with a consistent experience.
The current 120-volt power outlet features three holes: two parallel rectangular slots, one for the "live" wire and one for the neutral wire, and one circular hole for the ground wire. The majority of outlets are "duplex" receptacles, meaning they have two spots to plug in electrical equipment. However, some households have four-wire circuits that require a 120-volt receptacle with six holes to accommodate all the wires. These are called "triplex" receptacles.
A household with eight or more people usually has a breaker panel with at least 10 outlets so that everyone can keep their belongings while avoiding having their things stolen. A 20-amp circuit will have two 10-outlet breakers; a 30-amp circuit will have three 10-outlet breakers. If you have a garage, shed, or other building attached to your house with its own circuit breaker, it may have its own set of lights and appliances too, which would also use up available outlets on your main circuit.
Almost all new homes in regions that use electricity supply systems have outlets that accept three wires - hot, hot, and ground. The third wire is called "grounding" because it allows electricity to flow safely away from houses and buildings to the local electric company's distribution grid.
Domestic and industrial outlets are the two main categories. While it may not be evident from the outside, the two sides of an electrical outlet form part of a "loop of wire," and connecting an electrical device into that outlet completes that loop, allowing electricity to flow through the item and allowing it to work. The word "outlet" comes from the term "outside plant," which is what electrical companies used to connect their wiring to local homes and businesses.
The three common types of household outlets are straight-through, switch, and double-switch. They all function in basically the same way, but they do so using different internal components to provide voltage separation (which is protection against electric shock) and current limitation (to prevent overheating).
Straight-through outlets have no on/off switches of their own. Instead, they use the ones on the wall panel to which they are connected to control the flow of current through them. This type of outlet can only supply power to one thing at a time, so if you want to plug in several lamps or appliances into it, you'll need multiple sets of extension cords or power strips.
Switch outlets turn on the power to the outlet, but not until you push a button to open the circuit. Thus, they can accept power from many things at once. Most kitchen cabinets have standard switch boxes where you can install individual switches to control lights, coffee makers, and other small appliances.